Fumaramido bis(pyridinium salts)

ABSTRACT

Bis(pyridinium quaternary salts), typically those of the formula:   wherein R1 and R2 which may be the same or different are each alkyl having 8 to 14 carbon atoms, n-undec-10-yl, 2-nhexyloxyethyl, 2-(2-butoxyethoxy)-ethyl, 3,4-dichlo 4chlorobenzyl, 2,4-dichlorobenzyl or 2-naphthylmethyl A1 and A2 are each a direct linkage or a linking group of the formula CH2CO.NH- wherein the methylene is joined to the pyridine nitrogen; (X1.X2)2 represents two monoanions or a dianion selected from the group consisting of two halide, methanesulphonate, toluene-p-sulphonate or acetate ions or the sulphate dianion; and A3 is a linking group of the formula:

United States Patent [191 Edwards [451 Sept. 23, 1975 FUMARAMIDO BIS(PYRIDINIUM SALTS) [75] Inventor: Philip Neil Edwards, Macclesfield,

England ['73] Assignee: Imperial Chemical Industries Limited, London, England [22] Filed: Dec. 27, 1973 [2]] Appl. No.: 428,693

Related US. Application Data Division of Ser. No. 234,648, Mar. 14, 1972, Part No. 3,786,058 I [30] Foreign Application Priority Data Mar. 29, 1971 United Kingdom..- 8071/71 [52] US. Cl. 260/240 J [51] Int. C|. C07D 31/44 [58] Field of Search 260/295, 294.8 R, 295 PA, 260/295 AM, 295 Q, 295.5 A, 295.5 D, 296

[56] References Cited UNITED STATES PATENTS 2,520,902 9/1950 Bersworth 260/295 R 3,786,058 l/l974 Edwards...,l 260/294.8 R

Primary Examiner Henry R. Jiles Assistant ExaminerRobert W. Ramsuer Attorney, Agent, or FirmCushman, Darby & Cushman [57] ABSTRACT Bis(pyridinium quaternary salts), typically those of the formula:

a A l ll 2 2 AR AR A process for making these salts, compositions containing them and methods of preventing the growth of, or killing, bacteria by applying one of these salts to a bacterially infected environment are also disclosed.

4 Claims, No Drawings FUMARAMIDO BIS(PYRIDINIUM SALTS) This is a division of application Ser. No. 234,648, filed Mar. 14, 1972 and now US. Pat. No. 3,786,058.

This invention relates to novel pyridine derivatives which possess valuable antibacterial properties and some of which are useful in dental hygiene for inhibiting the formation of dental plaque.

According to the invention there is provided a pyridine derivative of the formula:

wherein R and R which may be the same or different, are each an alkyl, alkenyl, alkoxyalkyl, alkoxyalkoxyalkyl, alkanoyloxyalkyl or aryloxyalkyl radical of at least 6 and not more than 14 carbon atoms, a phenyl or naphthyl radical containing to 3 halogen atoms, or an alkyl radical of 1 to 3 carbon atoms which is substituted by a phenyl or naphthyl radical which is itself substituted by 0 to 3 halogen atoms or alkyl or alkoxy radicals of l to 6 carbon atoms; A and A which may be the same or different, are each a direct linkage or a linking group of the formula -CH CO.NH wherein the methylene radical is joined to the pyridine nitrogen atom; (X.)(*) represents two monoanions or a dianion; and A is a linking group selected from alkyl or aryl radical of up to carbon atoms, and provided that both ns are not 0,

whereinn is 0, l or 2;m isOto l2;xis0or 1;yis 0 or 2 to 6; z is 2 or 3; Y is a phenylene or naphthylene radical; and Z is a straightor branched-chain alkylene radical of 2 to 8 carbon atoms.

When R and R are alkyl, alkenyl, alkoxyalkyl, alkoxyalkoxyalkyl, allcanoyloxyalkyl or aryloxyalkyl radicals, they are preferably straight-chain such radicals, for example n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tetradecyl, n-undec-IO -enyl, 2-nhexyloxyethyl or 2-(2-butoxyethoxy)ethyl radicals.

When R and R are phenyl or naphthyl radicals concarbon atoms may be, for example, the methyl radical,

so that R and R may be, for example, 3 ,4-

dichlorophenyl, 4-chlorobenzyl, 2,4-dichlorobenzyl or Z-naphthylmethyl radicals.

When (XKX represents two monoanions, suitable anions are, for example, halide anions, for exampie chloride or bromide anions, anions derived from a carboxylic acid, for example the acetate anion, or anions derived from a sulphonic acid, for example the me thanesulphonate or toluene-p-sulphonate anions; and I when (30.)?) represents a dianion, a suitable anion is, for example, the sulphate or phosphate anion.

It is to be understood that although (X'.X represents two monoanions or a dianion, the corresponding monovalent radicals or atoms are X and X and the corresponding divalent radical is (X.X Thus, for example, X' and X may each be chlorine or bromine atoms, or methanesulphonyl, toluenesulphonyl or acetoxy radicals, and (X .X may be, for example, the sulphate divalent radical.

A suitable phenylene or naphthylene radical is, for example, the o-phenylene, m-phenylene, p-phenylene, 1,4-naphthylene, 1 ,S-naphthylene, 4-methyl-l ,2- phenylene, 2,5-dimethyl-l ,4-phenylene, 2,5-dimethoxy-l,4-phenylene or 2,4,5,6-tetrachloro- 1,3-phenylene radical.

A suitable value for Z is, for example, the ethylene, trimethylene, hexamethylene or 2,2- diethyltrimethylene radical.

Preferred linking groups A are those numbered 1, 2, 6, 8, 9, 11, 12, 14, 15, 17, 18, 23, 24, 25, 26, 27, 28 and 29 in the list above, and of these, particular linking groups A are:

--CO.NH NH.CO (l l. Y=l ,Z-phenylene) NHCO- (l l, Y=l ,4-phenylene) Continued phenylene) Preferred compounds of the invention are those wherein the radicals AR and A R are the same, and a preferred group of pyridine'derivatives of the invention comprises those compounds of the formula I above wherein A and A are each a direct linkage, R and R are each the same alkyl or alkenyl radical of 8 to l 1 carbon atoms, (XKX) represents two bromide, chloride, methanesulphonate, toluene-p-sulphonate or acetate anions, or the sulphate dianion, and A is:

NH.CO.NH--

NH.CO.NHCH,

NH.COCH=CHCO.NH-

A particularly preferred sub-group within the above group comprises those compounds wherein A and A are each a direct linkage, R and R are each an unbranched alkyl radical of 8 to l 1 carbon atoms, optionally containing a terminal double bond, (X.X') represents two bromide, chloride, methanesulphonate, toluene-p-sulphonate or acetate anions, or the sulphate dianion, and A is the trimethylene or ureylene radical or a radical of the formula -NH.CO(CH CO.NH, and especially those compounds wherein A is linked to the same numbered carbon atom of each pyridine ring.

Particular new pyridine derivatives of the invention are described in Examples 1 to 4, and of these, individual, specially preferred derivatives are 4,4- trimethylenebis( l -n-decylpyridinium methanesulphonate), (compound 5 decylpyridinium methanesulphonate), (compound 25); 3,3'-ureylenebis( l-n-decylpyridinium chloride), (com- 3,3 ureylenebis( l-npound 26); 3,3'-glutaramidobis(l-n-decylpyridinium chloride), (compound 78); 3,3'-glutaramidobis( l-ndecylpyridinium methanesulphonate), (compound 79); 3,3'-adipamidobis( l-n-decylpyridinium methanesulphonate), (compound 30); 4,4-adipamidobis(l-ndecylpyridinium methanesulphonate), (compound 82); 3,3 '-pimelamidobis-( l-n-decylpyridinium chloride), (compound 86); 3 ,3 '-suberamidobis( l -ndecylpyridinium chloride), (compound 87); 3,3- suberamidobis( l-n-decylpyridinium methanesulphonate), (compound 88); 3,3 '-azelamidobis( l -ndecylpyridinium methanesulphonate), (cpmpound 90); 3 ,3 '-sebacamidobis(l -n-octylpyridinium methanesulphonate), (compound 31); and 3,3'-sebacamidobis( ln-decylpyridinium methanesulphonate), (compound 32).

According to a further feature of the invention there is provided a process for the manufacture of the novel pyridine derivatives of the invention which comprises:

a. the quatemisation of a pyridine derivative of the formula:

with a quatemising agent or quatemising agents (RA).X (R A).X or (RA)(R A ).(X .X) wherein A, A A, R and R havethe meanings stated above and X, X and (X.X) are radicals derived from the acids HX, HX and H,(X.X) respectively, which are strong acids; or Y b. the quatemisation of a pyridine derivative of the formula:

contains one or two amide linkages, the reaction of a mono-carboxylic acid of the formula:

OOH [V or a reactive derivative thereof, with a suitable monobasic or dibasic compound, or the reaction of an amine of the formula:

with a suitable di-isocyanate, or the reaction of an isocyanate of the formula: (C zhthq V l 1 AR (CH,),,.NCO. (xu 1x with a suitable monoor di-carboxylic acid, or a reac- N with a suitable dihydroxy compound wherein A, R, X and n have the meanings stated above; or

h. for those compounds wherein the linking group A contains one or two olefinic linkages, the reaction of an activated methylpyridinium salt of the formula:

(CH,),,.NCO (x0 Vl CH (x') X wherein A, R, X and n have the meanings stated above, with a suitable monobasic or dibasic compound;

or wherein A, R and X have the meanings stated above,

for those compounds wherein the linking group A3 with a suitable monoor di-aldehyde whereafter if decontains one urea linkage and which are symmetrical, sired a product thus obtained containing an anion ii if k llif IIL$Z"3LLZZZZTL$ above, with a carbonyl compound of the formula 2 e (R) CO wherein R is a chlorine atom a lower alkoxy 35 (X or by thereotifouowed by radical a p y radical or reaction of the basified product with an acid HX, l-IX H .X" h X,X ,X dXh f. for those compounds wherein the linking group A f gif g g z g? by an gz rz gg mean zgxx sor n pzurlli a xe 133:3":V fifl: ::3:b; The duaternisation process is preferably carried out chloroformate ester or the reaction of a chloroformate 40 by 'heatmg together time pyr-ldme denvatwe and quatermsmg agent, and the ll'lCiLlSlOIl of a solvent, for example eser of the formula: nitrobenzene, sulpholane or toluene, is often advantageous in improving the mutual solubilities of the reactants, or to moderate the reaction. The addition of a tertiary amine, for example a hindered tertiary amine such as di-isopropylethylamine is also useful, for re- (CHLPQCOCL e v" moving any acid generated during the reaction.

The processes (0) to (h) for the formation of amide, urea, urethane or olefin linkages may be carried out in generally known manner described in the literature for analogous compounds.

A suitable strong acid HX, HX or H (X .X) has a wherein 1 1 x! and n have the meanings stated pK value of less than 2, and is, for example, hydrochloabove, with a Suitable dibasic compound; or ric, hydrobromic, methanesulphomc, toluene-pg. for those compounds wherein the linking group A suphonc contains two urethane linkages, the reaction of a hy- As Stated above new P P K droxy compound of the formula possess valuable antibacterial properties, m that they are effective against a wide range of both Grampositive and Gram-negative organisms, including strains of, for example, Pseudomonads which are resistant to other widely-used antibacterial agent. Further advantages of the preferred compounds of the inven- I tion may include, for example, rapid speed of kill, being bactericidal rather than bacteristatic, not being deacti- N A vated by hard water, or having more surface activity. i Further, textile materials which have been in contact AR' with the compounds of the invention are not stained by treatment with hypochlorite bleach.

ing compound containing a different anion (X) Thus, according to a further feature of the invention, there is provided a composition comprising at least one pyridine derivative of the invention together with an 1 inert diluent or carrier.

' (at user dilution) of a compound of the inventionjand toothpastes and dental gels containingbetween 0.05% and 1.0% w/w, preferably between 0.1% and 0.5% w/w, of a compound of the invention. v v

The invention is illustrated but not limited by the fol The composition of the invention may be a pharmaceutical composition, for example in the form of a 102- lowing Examples: enge suitable for oral administration, or an ointment, cream, or sterile aqueous or oily solution or suspension EXAMPLE 1 for topical use; or it may be a non-pharmaceutical com- General procedure for quatemisafion position, in the form of, for example, a non-stenl1sed l0 i aqueous or oily solution or suspension, or an aerosol, The Py denvatwe mole) and the lf for use as a general, environmental antiseptic or disinmg agent. mole) together l f ,fectant, or a mouthwash, paste, gel or fluid suspension y l mcluslon Ofa sollf'em, mtrobenzene to suitable for use in dental hygiene for the inhibition of Prove mulmal Pm to moderate h f' dental plaque formation tion, and/or a hindered amine, for example d1- The composition may contain conventional excipif- P PY X to remove y acld generated ents and carriers, and may be manufactured by the apmg the m Th tempemnfre d of heatmg plication f conventional techniques are shown for each compound in the Tables, but these Preferred pharmaceutical compositions of the invenare not necesanly P condmons and f'y can tion are lozenges, each containing from '0.1 to 1.0% usuallybe Varled f Wide g -T qp q l5 y w/w of a new compound of the invention, and preferred talllsed from a suitable S {1nd, required the non-pharmaceutical compositions are an aqueous soluamon can be changgd l conventional P for tion suitable for use as an antiseptic and containing example by use of lon'exchange from 0.02 to 1.0% w/v of a compound of the invention, anaqueous' solution in the form of a concentrate containing from 1% w/w to that percentage which gives a saturated solution of a compound of the invention, or Q powder or tablets for dissolution in water to give an aqueous solution'suitable for use as an antiseptic. Preferred compositions for use in dental hygiene are mouthwashes containing between 0.05% and 0.5% w/v No. A=A- R=R'- First A Second x =x linkage linkage"" 1 noctyl 4 CH. .CH, 4 MSW 2 n-decyl 4 -C H- .CH I 4 Ms 3 n-dodecyl 4 "CH2CH2 4 Ms 4 n-octyl 4 2)U 4 M5 5 n-decyl 4 (CH:);, 4 Ms 6 n-dodecyl 4 (CH 4 Ms 7 n-tetra- 4 (CH2)3+- 4 Br decyl 8 n-dccyl 4 CH:CH 4 Ms 9 n-undecyl 4 .-CH:CH- 4 Br l 0 n-dodecyl 4 -CH:CH 4 Ms 1 1 l3 CH2CO 3,4-di- 4 CHICH 4 C (e) NH chlorophcnyl l2 n-octyl 2' CH:CH 2 MS 13 n-decyl 2 -CH:CH 2 Ms l4 n-octyl 3 CH:CH 3 Ms l5 n-dccyl 3 CH:CH- 3 Ms l6 n-dodccyl 3 -CH:CH 3 Ms l7 n-octyl 3 CH:CH 4 Ms I8 n-decyl 3 CH:CH ,4 Ms 1) Z-n-hexyl- 3 CH:CH 4 Ms oxycthyl 7 2o 4-chlor0- 3 CH:CH- 4 c1.

bcnzyl 21 2,4-di- 3 -CH:CH 4' c1 chlorobcnzyl 22 2-nuphthyl- 3 -CH:CH 4 Brmethyl 23 ndcc \'l 2 CH:CH 3 Ms 24 n-octyl 3 NH.CO,NH- 3 M5 25 n-dccyl 3 NH.CO.NH 3 Ms "6 n-dccyl 3 NH.CO.NH 3 Cl 27 n-decyl 3 NH.CO.CO.NH- 3 Ms 28 n-dccyl 3 NH.CO(CH2)2 3 Ms CO.NH- Z) n-octyl 3 -NH,CO(CH. 3 Ms CO.NH 30 n-dccyl 3 NH.CO(CH, 3 Ms CO.NH 3l n-octyl 3 NH C'O(CH, ,)N 3 Ms CO.NH 32 n-dccyl 3 NH.CO(CH, 3 Ms CO.NH-

-Continued No A '=A'-' R=R2 First A""" Second X'=X'-' linkugc" linkugc" 33 n-tlccyl 3 CH. .,NH.CO.NH. 3 Br CHI 34 n-tlccyl 3 CH vNH- 3 Ms ICO(CH2)2 CO.NH.(H:- 35 n-dccyl 3 ('H ,.NH- Ms .c'omu i, CO.NH.CHZ 3h n-octyl 3 NH4CO 3 Ms 37 n-dccyl 3 NH.CO 3 Ms 3X n-octyl 3 NH.CO- 4 Ms 3 n-dccyl 3 -NH.CO- 4 Ms 4!) n-octyl 3 (.'H ,.NH.CO 3 Ms 41 n-LlCCyi 3 -CH. ..NH.CO 3 Ms 4" u-uctyl 2 -CH1.NH.CO 3 Ms 43 n-tlucyl 2 -CH. ,rNH.CO- 3 Ms 44 n-octyl 3 -CH ,NHlC'O- 4 Ms 45 n-dccyl 3 4 Ms 46 n-octyl 2 H, 4 Ms 47 n-dccyl 3 -CH. ,.NH.C'O- 4 Ms 4X n-octyl 4 -CO.NH(CH- 4 Ms NH.CO- 4) n-dccyl 4 -CO.NH(CH. 4 Ms NH,CO- 5U n-dccyl 4 CO.NH(CH .).L 4 Ms NH.CO

a. linkage of left hand pyridine ring to A 111 the for- -Cont1nued mula as written at the head of the table. R I b. where A is not symmetrical, it should be read as cacao con long from left to right in the formula at the head of the No. Tempera- Time Additive M.p.(C.) table ture (minutes) 3 (0) c. linkage of A to right hand pyridine rmg m the formula as written at the head of the table. a; {2g I S ng: d. Ms=methanesulphonate. 36 130 is DIE 157-160 e t th i i- 37 140 30 DIE l68-l7l e the methylene group Is attach d o e py l 38 I30 30 DE SW52 trogen atom, and the NH group Is attached to R. 39 I30 30 166.168

40 140 30 DIE 68-69 41 I40 30 DIE 167-169 42 130 30 DIE 158-160 43 I30 30 ME 123-125 Reaction COIldnlOnS No Tempera- Time Additive M.p.(C.) 45 I30 60 DIE 62-64 ture 40 46 140 30 DIE l7l-l74 (C.) (minutes) 47 l 30 30 DIE 89-92 48 160 30 DIE 167-168 1 120 5 162465 49 165 30 DIE 174-176 2 20 5 190.192 50 160 60 DIE 59-61 3 155 10 265-267 (decomposition 4 I20 10 61-63 45 5 120 I0 78-81 6 120 I5 87-89 7 I30 15- 83-86 8 130 30 20l 205 a. approximate m.p., compound very hygroscopic. 9 I30 10 315-317 b. DIE= di-isopropylethylamme. :28 22 Certain of the un-quaternised pyridines, wherein A (decomposmon) 50 is an amide containing linkage, used as starting materi- I2 I40 60 210-211 als for the above compounds are novel, and may be ob- :3 3g {$3132 tained by the following process which exemplifies the I5 I25 20 196-198 preparation of the un-quaternised pyridine starting ma- 3:3 terial for compounds 40 and 41: I8 I30 10 109412 Nicotinoyl chloride (14.15g.) was added over ten 19 130 I0 :30; minutes, with stirring and cooling in an ice bath, to a i 33 g 224:229 solution of 3-aminomethylpyridine (10.8g.) and trieth- 22 I30 4 273-276 ylamine (10.1g.) in methylene chloride (50ml.). After 53 :28 g I 621 3; 5 the addition was complete, the mixture was stirred at 25 130 5 room temperature for an hour, diluted with water 26 I 1 239-5-244 (ml.), and the product was isolated from the or- 27 l80 5 nitro- 239-243 benzene gamc phase by evaporation of the solvent. The crude 28 170 5 202-2045 product was recrystallised from ethyl acetate, 29 160 5 l86-l90 o o 30 I50 5 203-2066 65 31 5 H-103 The following starting materials were prepared sImI- 32 5 larly, using the appropriate acid chlorides and amino 33 20 nItro- Not crystalline benzene compounds:

The unquaternised pyridine starting material for for M.p. (C.) compound 32 is also a novel compound and may be Egg prepared as follows:

3-Aminomethylpyridine (10.8g.) and diphenyl car- 5 bonate (10.7g.) were mixed, heated together at 140C. 5; 2335 for five minutes, and the mixture was cooled and stirred 29, 2435 with ether. The product was filtered off, washed with 31. 32 161-164 fresh ether, and recrystallised from ethyl acetate, 34 196-2005 0 o 35 1344 m.p.l30.5 l33.5 C. 38,39 l63-l66 1 40,41 lO4-l06 EXAMPLE 2 42, 43 75-78 44,45 78-80 The process described m Example 1 is repeated, 47 using the appropriate bis-pyridine derivatives and quaternising agents, to give the following compounds:

3 (X1 xzz eo (9 0 I I AIRI A. .2

Nov A 2 R =R First A"'" Second X'=X2 linkagc linkugc 5l -CH2CO.- l'l-OCt)l 4 CH- ,.CH- 4 C] uI) 52 CH2CO. n-dccyl 4 CH. ,.CH. 4 7 c1 NH 53 n-nonyl 4 (H:CH 4 Ms 54 3.5.5- 4 (H:CH- 4 Ms trimethyl hexyl 55 n-decyl 4 CO.NHNH.CO(CH- 4 Ms CO.NHNH.("O

5s n'decyl 3 CO.N' N.c0 3 Ms 57 CH2CO.- n-octyl 3 C0.N; N.CO 3 Cl NH 5x CH2CO.- l'l-(lCCyl 3 CoiN Ntco- 3 Cl NH L1 59 CH- ,COv n-dodccyl 3 CO.N-- N.CO 3 (I NH so i n-dccyl 3 CO.NHNH.CO- 3 Ms 6| n-dccyl 3 CO.NH(CH- ,)4NH.CO 3 Ms 62 n-dccyl 3 CO.NH NH.CO 3 Ms e3 n-dccyl 3 -C0.NH- NH.C0 3 Ms (14 n-dccyl 3 NHvCO CO.NH 3 Ms 65 n-dccyl 3 NH.CO.NH(CH2),-,NH.- 3 Ms (0.NH- 66 n-Llccyl 3 NH.CO.NH(CH- ,)4NH.- 3 Ms CO.NH e7 ndcc)'l 3 --NHvCO.NH(CH- NH. I 3 Br CO.NH 6X n-dccyl 3 SE. .ES.3CNHH(CHQ)H 3 2 Br 69 Mo -1 3 -NH:CO:NH 3 Ms 70 n-dccyl 4 -N'H.CO.NH 4 Ms 7] undec- 3 NH.(O.NH- 3 Ms lU-enyl mula as written at the head of the table.

b. where A is not symmetrical, it should be read as Reaction conditions from left to right in the formula at the head of the Temgeraw'e T Addiive table C-) (minutes) c. linkage of A to the right hand pyridine ring in the 2 160 I Iii-H45 formula as written at the head of the table 50 63 l 1287130 64 195 210.5-212.5 d. the methylene group 15. attached to the pyridine n1-' 65 180 95-98 trogen atom, and the NH group is attached to R. 2?, 23 1 32 e. MS= methanesulphonate. 3 140 91 95 71 150 2 zoo-203.5 72 100 15 250-252 73 5 15 250-253 Reaction condmons v 74 100 1 258,460 No. Temperature Time Additive M.p. (C.) 75 130 30 5-9 ("C.) (minutes) 76 I80 20 -113 60 77 160 10 142-1445 51 110 15 237439 78 150 60 sulphol e 2145-2165 52 110 15 261-266 79 154455 53 Mo 10 255 80 10 197-199 54 12s 20 200-250 Bl 5 156-159 55 160 30 1 54 82 5 120-123 56 130 10 212-214 65 83 5 225-223 57 120 20 23 239 5 84 160 2 1965-1975 58 1 10 30 toluene 229-231 85 130 l 228-23 59 1 10 3o toluene 224-228 86 120 ipgyg 1 16-120 60 5 168-171 1 61 150 15' 122-125 87 150 60 sulpholane 213-2145 Co ntinued Reaction conditions a. DIE di-isopropylethylamine. A. Certain of the unquaternised pyridines, wherein A is an amide-containing linkage, used as starting ma- -A solution of hexamethylene di-isocyanate (1.68g.)

in toluene (10m1.) was added to a solution of 3- aminopyridine 1.88g.) in toluene 18ml.) and the mixture'was heated on a steam-bath for 10 minutes. The mixture was cooled, andthe product was filtered off, washed with toluene and dried, to give 1,6-bis[3- (pyrid-3-y1)ureido]hexane, m.p.1971 99C., the starting material for compound 67.

In a similar manner, using 3-aminomethylpyridine in place of 3-aminopyridine, there was obtained the starting material for compound 68, 1,6-bis[3-(pyrid-3- ylmethyl)ureido]-hexane, m.p.223-225C.

C. Certain other of the unquatemised pyridines, wherein A is a ureidoor urethane-containing linkage, used as starting materials for the preparation of the above compounds of the invention, are novel and may be obtained as follows:

A solution of tetramethylene diamine (0.535g.) in

terialsfor the above compounds are novel, and may be 20 toluene m was added with Stirring and cooling to obtained from the reaction of an appropriate amine and an appropriate acid chloride by the process described in the latter part of Example 1.

Starting material M.p. (C.)

for compounds nos.

B. Certain other of the unquatemised pyridines, wherein A is a ureido-containing linkage, used as starting materials for the preparation of the above compounds of the invention, are novel and may be obtained as follows:

a solution of 3-pyridyl isocyanate (1.46g.) in toluene (15ml.). The mixture was stirred until the reaction was complete, and the product was filtered off, washed with toluene and crystallised from ethanol to give 1,4-bis[3- (pyrid-3-yl)ureidol-hexane, m.p.218-2l9C., the starting material for compound 66.

In a similar manner, using the appropriate isocyanate and the appropriate amine, diamine or diol, the following starting materials were prepared:

EXAMPLE 3 The process described in Example 1 is repeated using the appropriate bis-pyridine derivates and quaternising agents, to give the following compounds:

a. linkage of left hand pyridine ring to A in the formula as written at the head of the table.

b. where A is not symmetrical, it should be read as from left to right in the formula at the head of the table.

c. linkage of A to the right hand pyridine ring in the formula as written at the head of the table.

d. t indicates a trans double bond.

e. Ms= methanesulphonate.

The unquaternised pyridine derivatives used as starting materials in the preparation of compounds 100 and 101 are novel, may be prepared by the process described in the latter part of Example I, and have melting points of 32l.5-322.5C. and 1 l7l 19C. respectively.

The unquaternised pyridine derivatives used as starting materials in the preparation of compounds 103 and 104 are novel, may be prepared by the process described at (C) in Example 2, and have melting points of l2l-l23C. and l94-l94.5C. respectively.

The unquaternised pyridine derivative used as starting material in the preparation of compound 109 may be obtained as follows:

Sodium hydride (1.32g.) was added proportionwise under an atmosphere of nitrogen during 30 minutes, to a stirred solution of 3-hydroxypyridine (2.85g.) in dry dimethylsulphoxide (28ml.) cooled to below 25C. When reaction ceased, l,6-di-bromohexane (3.66g.) was added dropwise with stirring and cooling, and the resulting mixture was stirred a further 3% hours. The mixture was poured into ice-water, and the precipitated product was filtered off and crystallised from petroleum ether (b.p. 6080C.), to give 1,6-bis-pyrid-3- yloxyhexane, m.p. 85C.

In a similar manner, using the appropriate dibromides, there were obtained the butane (m.p.95C.) and decane (m.p.64C.) analogues, the starting materials for compounds 108 and 110 respectively.

EXAMPLE 4 The methanesulphonate salt, compound 32 (3g) was dissolved in water and excess 2N sodium hydroxide was added. A yellow viscous oil separated which was extracted into chloroform. The chloroform layer was washed with water, and then shaken with excess aque ous toluene-p-sulphonic acid. Ether was added to precipitate the toluene-p-sulphonate salt, which was crystallised from a mixture of acetone and acetonitrile, m.p.l27-l29C.

The sulphate was prepared in similar manner, m.p.l46-l47C.

The acetate (m.p.8789C.) was prepared in similar manner, except that the new salt remained in the aqueous phase and was recovered by evaporation of the solvent and crystallisation of the residue from acetone.

EXAMPLE 5 Compositions containing a pyridine derivative of the invention may be prepared from any pyridine derivative of the invention described in the foregoing Examples by conventional procedures as illustrated below, where, it is to be understood, the particular pyridine derivative named may be replaced by an equipotent amount of any other pyridine derivative of the invention.

LOZENGE A mixture of sucrose (92.5g.), magnesium stearate' (lg.), gum acacia (3g.), water (3ml.) and 3,3-

suberamidobis(l-n-decylpyridinium chloride) (0.5g.) is blended and compressed into hard lozenges such that each weighs 1g, and contains 5mg. of the antibacterial pyridine derivative.

ANTISEPTIC 3,3'-Suberamidobis( l-n-decylpyridinium methanesulphonate) (0.5g.) is dissolved in sterile distilled water (99.5ml.) to give a liquid composition suitable for use as an antiseptic.

TOOTHPASTE A solution is prepared by stirring saccharin sodium (0.2g.) in purified water (38.8ml.) to which is then added isopropanol (4.0g.) and glycerin (20g) (Solu tion I). y

A mixture of oil of peppermint (0.6g.) and oil of spearmint (0.3g.) is added to Pluronic P(0.6g. Pluronic is a trade mark) followed by 4,4- glutaramidobis( l-n-decylpyridinium methanesulphonate) (0.5g.) and stirring is continued until a homogeneous solution is formed (Solution ll).

Solution 1 is slowly added to Solution II, with stirring, and natrosol 250HH (lg. Natrosol is a trade mark) is then added, stirring being continued until hydration is complete. A mixture of dicalcium phosphate (20g.), Neosyl E.T. (l0g.), titanium dioxide (lg.) and dried aluminum hydroxide gel (lg.) is then added and mixing is continued until a smooth and uniform paste is formed.

What we claim is:

l. A pyridine derivative of the formula:

NH.COCH=CHCO.NH.

2. The pyridine derivative of claim 1 wherein R and R are the same and are each n-octyl, n-nonyl, n-decyl,

n-undecyl, n-dodecyl, n-tetradecyl, n-undec-lO-enyl,

2-(2-butoxyethoxy)ethyl, 3,4-

dichlorophenyl, 4-chlorobenzyl, 2,4-dichlorobenzyl or 2-n-hexyloxyethyl,

Z-naphthylmethyl.

3. The pyridine derivative of claim 1 wherein A and A are each a direct linkage, R and R are each the same unbranched alkyl of 8 to 11 carbon atoms, (X

X represents two bromide, chloride, methanesulphonate, toluene-p-sulphonate or acetate anions or the 4. A pyridine derivative as claimed in claim 1, said sulphate dianion, and A is a linking group of the forderivative being 3,3'-fumaramidobis(l-n-v mula: 5 decylpyridinium methane-sulphonate).

NH.COCH=CHCO.NH. 

1. A PYRIDINE DERIVATIVE OF THE FORMULA:
 2. The pyridine derivative of claim 1 wherein R1 and R2 are the same and are each n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tetradecyl, n-undec-10-enyl, 2-n-hexyloxyethyl, 2-(2-butoxyethoxy)ethyl, 3,4-dichlorophenyl, 4-chlorobenzyl, 2,4-dichlorobenzyl or 2-naphthylmethyl.
 3. The pyridine derivative of claim 1 wherein A1 and A2 are each a direct linkage, R1 and R2 are each the same unbranched alkyl of 8 to 11 carbon atoms, (X1. X2)2 represents two bromide, chloride, methanesulphonate, toluene-p-sulphonate or acetate anions or the sulphate dianion, and A3 is a linking group of the formula: -NH.COCH CHCO.NH-.
 4. A pyridine derivative as claimed in claim 1, said derivative being 3,3''-fumaramidobis(1-n-decylpyridinium methane-sulphonate). 